>What if UNICODE devote a Web Site for PUA, that user will
provide
a BMP of the Code point they used (if it is of General
Intereset),
the next user will not use the point and will use the next,
this should be on volunteer basis
and the user must be free to use it or not.

I don't think that's a good idea because it suggests to users
expectations of how the PUA should be used and encourages a
standardisation of the PUA, which is expressly not the intent
of the PUA.